21702980

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^2\times {\mathrm{6421}}^1$

素因数の和:6456

約数の個数: 36

約数和(自身を含む): 49359492

約数和(自身を除く): 27656512

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 52, 65, 130, 169, 260, 338, 676, 845, 1690, 3380, 6421, 12842, 25684, 32105, 64210, 83473, 128420, 166946, 333892, 417365, 834730, 1085149, 1669460, 2170298, 4340596, 5425745, 10851490, 21702980]

約数ペア:

[(1, 21702980), (2, 10851490), (4, 5425745), (5, 4340596), (10, 2170298), (13, 1669460), (20, 1085149), (26, 834730), (52, 417365), (65, 333892), (130, 166946), (169, 128420), (260, 83473), (338, 64210), (676, 32105), (845, 25684), (1690, 12842), (3380, 6421)]